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Laser-induced incandescence particle image velocimetry (LII-PIV) for two-phase flow velocity measurement

Fan, Luming and McGrath, Dante and Cheng, Tung Chong and Mohd. Jaafar, Mohammad Nazri and Zhong, Hongtao and Hochgreb, Simone (2018) Laser-induced incandescence particle image velocimetry (LII-PIV) for two-phase flow velocity measurement. Experiments in Fluids, 59 (10). pp. 1-14. ISSN 0723-4864

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Official URL: http://dx.doi.org/10.1007/s00348-018-2610-4

Abstract

We demonstrate the use of laser-induced incandescence (LII) of submicron tungsten carbide (WC) particles as a method for particle image velocimetry (PIV). The technique allows a single laser to be used for separate measurements of velocity of two phases in a droplet-laden flow. Submicron WC particles are intentionally seeded into a two-phase flow, and heated by a light sheet generated by a double-pulsed PIV laser operating at sufficiently high pulse energy. The small size and large absorption cross section allows particles to be heated up to several thousand degrees Kelvin to emit strong incandescence signals, whilst the laser-induced temperature increase in liquid droplets/large particles is negligible. The incandescence signal from WC and Mie scattering from droplets/large particles are separately captured by deploying different filters to a PIV camera. The consecutive images of the laser-induced incandescence (LII) are used to determine the velocity field of the gas-phase flow, and those of Mie scatter are used to extract the velocity of droplets/large particles. The proposed technique is demonstrated in an air jet first and compared with the result given by a normal PIV test, which shows that submicron WC particles can accurately follow the gas flow, and that the LII images can be used to perform cross-correlations. We then apply this technique on an ethanol droplet/air jet (non-reacting), demonstrating the resulting slip velocity between two phases. The proposed technique combining PIV and LII with a single laser requires little additional equipment, and is applicable to a much higher droplet/particle density than previously feasible. Finally, the possibility of applying this technique to a flame is demonstrated and discussed.

Item Type:Article
Uncontrolled Keywords:absorption cross sections, additional equipment, consecutive images, cross correlations, droplet-laden flow
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:84502
Deposited By: Yanti Mohd Shah
Deposited On:11 Jan 2020 15:31
Last Modified:11 Jan 2020 15:31

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